Renewable fuse



L. ROSENTHAL AND G. J. LANG.

RENEWABLE FUSE.

APPLxcATloN man DEc.24, 1918.

Patented Maryl 17, 1921-.

W Y WY M A WA W UNITED STATES lPATENT oFFlCE.

p (LEON W. RosENTHAL, or NEW YORK, N. Y., AND GUSTAVE J. LANG, or WEEHAWKEN,

` NEW JERSEY, ASSIGNORSTO ARTHUR T. MURRAY, OIF ALLENTOWN,` PENNSYL- vANIA.

RENEW/'ABLE FUSE.

`"To all lwhom t concer/n.:

Be it known that we, LEON W'. RosENTHAL, a citizen of the United States, residing at 106 Central Park west, in the city, county, and State of New 'York, and GUs'rAvE J.

ILANG, a citizen of the United States residing at 849 Boulevard east, Weehawken in the county of Hudson andjvState `ofew ,e Jersey, have invented certain'new and useful Improvements in Renewable Fuses; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others lskilled inthe art to which it appertains to make and use the The present invention relates to renewable fuses in which a permanent fuse holder4 has Vterminals .forv connecting it in an electric Vcircuit and in which a renewable fuse. is

adapted to be inclosed bythe holder and electrically connected in a detachable manner to the terminals thereof. The object of the invention is to provide a permanentiand comparatively cheap fuse holder, which, when assembled, givesreliable and permanent contact between it and the inclosed fuse, and at the same time permits rapid renewal of a blown-out fuse without the use fof special tools. l

' Ini'prior fuses of this kind having detachable end plates and'ca'ps between which the fuse terminals are clamped, the fendA plates are sometimes'held in the tube by depending legs inserted into openings 'in thetube by a lateral movement. Whilel this arrangementV holds the-endl plates, and therefore the caps attached to themby screws, against longitudinal" movement with respect to the tube,

itis necessary tov accurately fit the parts together to prevent looseness, thereby en! tailing added cost in manufacture and rendering, renewals comparatively slow,

wInaccordance `with the present invention,

`the detachable end platesarefixed in position in the tube by meansfof bayonet slots, A which `eliminate the necessity for the nice fit and render the renewals more rapid, the end plates yhaving depending legs engaging thebayonet slots and adapted to be fastened Vtherein `and detached therefrom by ,longi-A tudinal and circumferential movements rela- 4tively to the ',tube.v In this way, the caps are' held against longitudinal movement on the tube when fastened to the end platesbut bothvthe` capS'Iid the end plates may be i we prefer to form each of the two bayonetV slots at eachend of the tube by a longitudinal passage extending from the end of the tube and joined to a circumferential passage with a terminal portion displacedfrom the bottom of the longitudinal passage, the tube having at its outer end correspondingly stepped seats, in which case the end plate comprises a ,bridge memberV adapted to rest on the outermost portionof the seatsy when the depending legs thereof are located in the terminal portions of the slots. More specifically, we prefer lto join the longitudinal passage of each slot,V to an inclined passage with a terminal circumferential portion and to provide inclined seats-`on the outer end of the tubesparallel to vthe inclined passages. In this waygbothendy platesare held against longitudinal movement, and circumferential4 movement thereof is, as a practical matter, prevented. V j

In the accompanying drawings illustrating two embodiments of the invention, Figure 1`is a section on line 1-1 of Fig.- 2 of a knife blade type of fuse ,-Fig. 2 is a section on line 2-k-2 of Fig.11; Fig. 3 `shows 'van' end portion of the tube; Fig.v 4:' is a sectionon line l--Ll of Fig. 1; Fig. 5 is a'perspective view of the Vend plate of this embodiment;

Fig. 6 is a section on line 66fof Fig.- 1;

posed bayonet slots and corresponding seats for the end plate.V

In the fuse of Figs. 1 tov 6, each bayonet slot consists of a longitudinal passage 2 'Oiled to L circumferential assa e 3. With `Specfcatioifl of Letters Patent. Patented May 17, 1921. i Application filed December 24, 1918. Serial No. 268,136. V

` readily disassembled from and then fastened Ymember rest on the outerseats 6 of the tube.

Y therein. y n

over the outside of the tube to form an ex# a terminal portion 4 stepped and therefore displaced from the bottom of the longitudinal. passage. Each end ofthe .tubeV is provided with depressed seats 5 and outer seats 6 registering with thefstepped portions of the circumferential passage, whereby the distance measured along the tube from the outer end thereof to the passage is the same all along the seats.

The endy plate consists of a bridge member 7 and two legs 8 depending therefrom and having end portions 9. By inserting these end portions into the opposite longitudinal assages 2,v the end plate may be moved ongitudinally of the tube until the end portions come into the circumferential passages 3, whereupon the, plate maybe turned Vcircumferentially, then lifted into the terminal stepped portion 4 and turned circumferentially until` the end portions 10 of the bridge In this position,.the end plate is held against longitudinal movement on thetube.

The end portions-of the fuse 11 are folded over the bridge members 7 to form terminals 12 between the screw-threaded openings V13 One terminal of the fuse extends posed portion at 14vbeyond the end of the cap to show a capacity marking thereon.

TheV caps 15 ofmetal arepositioned over Y theends of the tube and areffastened'to the end plates 'by the lend screws 16 ywhich lhold the caps. Lagainst longitudinal displacement on the tube and draw thev end portions 9 of the depending legs against the outer face of the terminal portions 4 of the bayonet slots while clampingV the fuse terminals 12 betweenthejend plates and caps.V When the caps are thus positioned, circumferential movement of the endplates is, as a practical matter, prevented also.

The? knife blades 17 are riveted or otheri wise suitably fastened to the caps to provide terminals for the fuse holder adapted to be A inserted in spring clips of a panel board.

In. the ferrule type of fuse shown in Figs.

7 to 10, the longitudinal portions 18 of the bayonet slotsl arejoined to the circumferential terminal portions 19 thereof by the inj clined passage 20, and likewise inclined seats 21 are provided at the outer'endsof the tube. The end platesVv in this casev consist ofthe bridge member 22 having depending legs 23 with pins 24 extending from. the legs and Y pins 25 extending vfrom the bridge member.

By Ythis construction, vthe legs of the end` platesI aremoved longitudinally through .the

y passa-ges 18 and are then turned up the'in-` clined passages 2() until the pins 24 rest in the terminal portions 19, while the pins v25 are seated onthe straight end portions 26 of the tube'.l The caps 27 are fastened tothe endV vplates by the central end screws 28 threaded into the bridge members 22, to prevent longicaps.

tudinal movement, and, as a practical matter, circumferential movement also, of the caps on` the tube while clamping the terminals 29 of the fuse 30 between the end.A plates and One terminal of the fuse is extended at'31 beyond the outer end of the cap to show an exposed capacity marking thereon". vThe Vcaps are adapted to be directly inserted between the spring fingers of a panel board.

In both embodiments, an exhaust passage for the gases of'combustion upon blow-out of the fuse is provided between the cap and y positioned over ythe outer'ends of the tube,

and end screws passing throughk the caps into threaded engagementwith the end plates to prevent llongitudinal movement of the caps on the tube while clamping the fuse terminals between the end plates and caps;

2. A renewable fuse consistingof' a tube having atreach endl longitudinal passages joined to circumferential passages with lterminal portions displaced from the bottom of the longitudinal'passages, and also having Y at each end stepped seats registeringwith the displaced portions ofl the circumferential passages,- detachable end plates each comprising a bridge member and depending legs adapted to be moved to the bottomV of the lonf gitudinalrpassages at that end andv then turned cireumferentially Auntil the ybridge member rests upon the outermost stepped seat with the legs in the terminal portionsof the circumferential passages,.a fuse passing through the tube and having end portions folded over the bridge members to form fuse terminals, caps positioned Vover the outer ends of the tube, and end screws passing through the caps into threaded engagement with the bridge members to preventlongitudinalmovement of the caps on the tube while clamping the fuse' terminals between the bridge members andcaps. Y 1

3.@A renewable fuse consisting of a tube having at eachv end longitudinal passages joined to inclined passages with terminal circumferential portions and also having inclined seats substantially parallel with the inclinedpassages, detachable end plates each comprising a bridge memberand dependinglegs adapted to be moved to the bottom of the Vlongitudinal passages at that end' and then l turned circumferentially along the inclined passages until the bridge member rests on the outermost part of the end of the tube with the legs in the terminal circumferential portions, a fuse passing through the tube and having end portions folded over the bridge members to form .fuse terminals, caps positioned over the outer ends of the tube, and

end screws passing through the caps into threaded engagement with the bridge members to secure the caps against longitudinal 10 movement on the tube while clamping the fuse terminals between the bridge members and caps. Y

In testimony whereof, we hereunto affix 3 our signatures.

LEON W. ROSENTHAL. GUSTAVE J. LANG. 

